How to apply overhead?

Hello everyone,

I have been asigned to find a way how to apply our average over head cost, $1.62 a gallon, to our finished goods...(keep in mind i do nothing with this part of X3 in my position so im just walking through the dark) On the "standard cost calculation" or "simulated cost calculation" they have the drop down menu titled "overhead column" and you can select formulas. I thought this could be an area where i can set up that price per gallon to be added to our cost calculation....ive watched youtube videos but nothing i seem to do actually seems to cross over to this section. it still says overhead is 0.00.

Any insight?